1652ecc20SKaiGai Kohei /* 2652ecc20SKaiGai Kohei * JFFS2 -- Journalling Flash File System, Version 2. 3aa98d7cfSKaiGai Kohei * 4aa98d7cfSKaiGai Kohei * Copyright (C) 2006 NEC Corporation 5aa98d7cfSKaiGai Kohei * 6652ecc20SKaiGai Kohei * Created by KaiGai Kohei <kaigai@ak.jp.nec.com> 7652ecc20SKaiGai Kohei * 8652ecc20SKaiGai Kohei * For licensing information, see the file 'LICENCE' in this directory. 9652ecc20SKaiGai Kohei * 10652ecc20SKaiGai Kohei */ 11aa98d7cfSKaiGai Kohei #include <linux/kernel.h> 12aa98d7cfSKaiGai Kohei #include <linux/slab.h> 13aa98d7cfSKaiGai Kohei #include <linux/fs.h> 14914e2637SAl Viro #include <linux/sched.h> 15aa98d7cfSKaiGai Kohei #include <linux/time.h> 16aa98d7cfSKaiGai Kohei #include <linux/crc32.h> 17aa98d7cfSKaiGai Kohei #include <linux/jffs2.h> 18aa98d7cfSKaiGai Kohei #include <linux/xattr.h> 19aa98d7cfSKaiGai Kohei #include <linux/posix_acl_xattr.h> 20aa98d7cfSKaiGai Kohei #include <linux/mtd/mtd.h> 21aa98d7cfSKaiGai Kohei #include "nodelist.h" 22aa98d7cfSKaiGai Kohei 23aa98d7cfSKaiGai Kohei static size_t jffs2_acl_size(int count) 24aa98d7cfSKaiGai Kohei { 25aa98d7cfSKaiGai Kohei if (count <= 4) { 26de1f72faSKaiGai Kohei return sizeof(struct jffs2_acl_header) 27de1f72faSKaiGai Kohei + count * sizeof(struct jffs2_acl_entry_short); 28aa98d7cfSKaiGai Kohei } else { 29de1f72faSKaiGai Kohei return sizeof(struct jffs2_acl_header) 30de1f72faSKaiGai Kohei + 4 * sizeof(struct jffs2_acl_entry_short) 31de1f72faSKaiGai Kohei + (count - 4) * sizeof(struct jffs2_acl_entry); 32aa98d7cfSKaiGai Kohei } 33aa98d7cfSKaiGai Kohei } 34aa98d7cfSKaiGai Kohei 35aa98d7cfSKaiGai Kohei static int jffs2_acl_count(size_t size) 36aa98d7cfSKaiGai Kohei { 37aa98d7cfSKaiGai Kohei size_t s; 38aa98d7cfSKaiGai Kohei 39de1f72faSKaiGai Kohei size -= sizeof(struct jffs2_acl_header); 40de1f72faSKaiGai Kohei s = size - 4 * sizeof(struct jffs2_acl_entry_short); 41aa98d7cfSKaiGai Kohei if (s < 0) { 42de1f72faSKaiGai Kohei if (size % sizeof(struct jffs2_acl_entry_short)) 43aa98d7cfSKaiGai Kohei return -1; 44de1f72faSKaiGai Kohei return size / sizeof(struct jffs2_acl_entry_short); 45aa98d7cfSKaiGai Kohei } else { 46de1f72faSKaiGai Kohei if (s % sizeof(struct jffs2_acl_entry)) 47aa98d7cfSKaiGai Kohei return -1; 48de1f72faSKaiGai Kohei return s / sizeof(struct jffs2_acl_entry) + 4; 49aa98d7cfSKaiGai Kohei } 50aa98d7cfSKaiGai Kohei } 51aa98d7cfSKaiGai Kohei 52dea80134SKaiGai Kohei static struct posix_acl *jffs2_acl_from_medium(void *value, size_t size) 53aa98d7cfSKaiGai Kohei { 54dea80134SKaiGai Kohei void *end = value + size; 55dea80134SKaiGai Kohei struct jffs2_acl_header *header = value; 56dea80134SKaiGai Kohei struct jffs2_acl_entry *entry; 57aa98d7cfSKaiGai Kohei struct posix_acl *acl; 58aa98d7cfSKaiGai Kohei uint32_t ver; 59aa98d7cfSKaiGai Kohei int i, count; 60aa98d7cfSKaiGai Kohei 61aa98d7cfSKaiGai Kohei if (!value) 62aa98d7cfSKaiGai Kohei return NULL; 63de1f72faSKaiGai Kohei if (size < sizeof(struct jffs2_acl_header)) 64aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 65dea80134SKaiGai Kohei ver = je32_to_cpu(header->a_version); 66aa98d7cfSKaiGai Kohei if (ver != JFFS2_ACL_VERSION) { 67aa98d7cfSKaiGai Kohei JFFS2_WARNING("Invalid ACL version. (=%u)\n", ver); 68aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 69aa98d7cfSKaiGai Kohei } 70aa98d7cfSKaiGai Kohei 71dea80134SKaiGai Kohei value += sizeof(struct jffs2_acl_header); 72aa98d7cfSKaiGai Kohei count = jffs2_acl_count(size); 73aa98d7cfSKaiGai Kohei if (count < 0) 74aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 75aa98d7cfSKaiGai Kohei if (count == 0) 76aa98d7cfSKaiGai Kohei return NULL; 77aa98d7cfSKaiGai Kohei 78aa98d7cfSKaiGai Kohei acl = posix_acl_alloc(count, GFP_KERNEL); 79aa98d7cfSKaiGai Kohei if (!acl) 80aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 81aa98d7cfSKaiGai Kohei 82aa98d7cfSKaiGai Kohei for (i=0; i < count; i++) { 83dea80134SKaiGai Kohei entry = value; 84dea80134SKaiGai Kohei if (value + sizeof(struct jffs2_acl_entry_short) > end) 85aa98d7cfSKaiGai Kohei goto fail; 86aa98d7cfSKaiGai Kohei acl->a_entries[i].e_tag = je16_to_cpu(entry->e_tag); 87aa98d7cfSKaiGai Kohei acl->a_entries[i].e_perm = je16_to_cpu(entry->e_perm); 88aa98d7cfSKaiGai Kohei switch (acl->a_entries[i].e_tag) { 89aa98d7cfSKaiGai Kohei case ACL_USER_OBJ: 90aa98d7cfSKaiGai Kohei case ACL_GROUP_OBJ: 91aa98d7cfSKaiGai Kohei case ACL_MASK: 92aa98d7cfSKaiGai Kohei case ACL_OTHER: 93dea80134SKaiGai Kohei value += sizeof(struct jffs2_acl_entry_short); 94aa98d7cfSKaiGai Kohei acl->a_entries[i].e_id = ACL_UNDEFINED_ID; 95aa98d7cfSKaiGai Kohei break; 96aa98d7cfSKaiGai Kohei 97aa98d7cfSKaiGai Kohei case ACL_USER: 98aa98d7cfSKaiGai Kohei case ACL_GROUP: 99dea80134SKaiGai Kohei value += sizeof(struct jffs2_acl_entry); 100dea80134SKaiGai Kohei if (value > end) 101aa98d7cfSKaiGai Kohei goto fail; 102aa98d7cfSKaiGai Kohei acl->a_entries[i].e_id = je32_to_cpu(entry->e_id); 103aa98d7cfSKaiGai Kohei break; 104aa98d7cfSKaiGai Kohei 105aa98d7cfSKaiGai Kohei default: 106aa98d7cfSKaiGai Kohei goto fail; 107aa98d7cfSKaiGai Kohei } 108aa98d7cfSKaiGai Kohei } 109aa98d7cfSKaiGai Kohei if (value != end) 110aa98d7cfSKaiGai Kohei goto fail; 111aa98d7cfSKaiGai Kohei return acl; 112aa98d7cfSKaiGai Kohei fail: 113aa98d7cfSKaiGai Kohei posix_acl_release(acl); 114aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 115aa98d7cfSKaiGai Kohei } 116aa98d7cfSKaiGai Kohei 117aa98d7cfSKaiGai Kohei static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size) 118aa98d7cfSKaiGai Kohei { 119dea80134SKaiGai Kohei struct jffs2_acl_header *header; 120dea80134SKaiGai Kohei struct jffs2_acl_entry *entry; 121dea80134SKaiGai Kohei void *e; 122aa98d7cfSKaiGai Kohei size_t i; 123aa98d7cfSKaiGai Kohei 124aa98d7cfSKaiGai Kohei *size = jffs2_acl_size(acl->a_count); 125dea80134SKaiGai Kohei header = kmalloc(sizeof(*header) + acl->a_count * sizeof(*entry), GFP_KERNEL); 126dea80134SKaiGai Kohei if (!header) 127aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 128dea80134SKaiGai Kohei header->a_version = cpu_to_je32(JFFS2_ACL_VERSION); 129dea80134SKaiGai Kohei e = header + 1; 130aa98d7cfSKaiGai Kohei for (i=0; i < acl->a_count; i++) { 131dea80134SKaiGai Kohei entry = e; 132aa98d7cfSKaiGai Kohei entry->e_tag = cpu_to_je16(acl->a_entries[i].e_tag); 133aa98d7cfSKaiGai Kohei entry->e_perm = cpu_to_je16(acl->a_entries[i].e_perm); 134aa98d7cfSKaiGai Kohei switch(acl->a_entries[i].e_tag) { 135aa98d7cfSKaiGai Kohei case ACL_USER: 136aa98d7cfSKaiGai Kohei case ACL_GROUP: 137aa98d7cfSKaiGai Kohei entry->e_id = cpu_to_je32(acl->a_entries[i].e_id); 138de1f72faSKaiGai Kohei e += sizeof(struct jffs2_acl_entry); 139aa98d7cfSKaiGai Kohei break; 140aa98d7cfSKaiGai Kohei 141aa98d7cfSKaiGai Kohei case ACL_USER_OBJ: 142aa98d7cfSKaiGai Kohei case ACL_GROUP_OBJ: 143aa98d7cfSKaiGai Kohei case ACL_MASK: 144aa98d7cfSKaiGai Kohei case ACL_OTHER: 145de1f72faSKaiGai Kohei e += sizeof(struct jffs2_acl_entry_short); 146aa98d7cfSKaiGai Kohei break; 147aa98d7cfSKaiGai Kohei 148aa98d7cfSKaiGai Kohei default: 149aa98d7cfSKaiGai Kohei goto fail; 150aa98d7cfSKaiGai Kohei } 151aa98d7cfSKaiGai Kohei } 152dea80134SKaiGai Kohei return header; 153aa98d7cfSKaiGai Kohei fail: 154dea80134SKaiGai Kohei kfree(header); 155aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 156aa98d7cfSKaiGai Kohei } 157aa98d7cfSKaiGai Kohei 158aa98d7cfSKaiGai Kohei static struct posix_acl *jffs2_iget_acl(struct inode *inode, struct posix_acl **i_acl) 159aa98d7cfSKaiGai Kohei { 160aa98d7cfSKaiGai Kohei struct posix_acl *acl = JFFS2_ACL_NOT_CACHED; 161aa98d7cfSKaiGai Kohei 162aa98d7cfSKaiGai Kohei spin_lock(&inode->i_lock); 163aa98d7cfSKaiGai Kohei if (*i_acl != JFFS2_ACL_NOT_CACHED) 164aa98d7cfSKaiGai Kohei acl = posix_acl_dup(*i_acl); 165aa98d7cfSKaiGai Kohei spin_unlock(&inode->i_lock); 166aa98d7cfSKaiGai Kohei return acl; 167aa98d7cfSKaiGai Kohei } 168aa98d7cfSKaiGai Kohei 169aa98d7cfSKaiGai Kohei static void jffs2_iset_acl(struct inode *inode, struct posix_acl **i_acl, struct posix_acl *acl) 170aa98d7cfSKaiGai Kohei { 171aa98d7cfSKaiGai Kohei spin_lock(&inode->i_lock); 172aa98d7cfSKaiGai Kohei if (*i_acl != JFFS2_ACL_NOT_CACHED) 173aa98d7cfSKaiGai Kohei posix_acl_release(*i_acl); 174aa98d7cfSKaiGai Kohei *i_acl = posix_acl_dup(acl); 175aa98d7cfSKaiGai Kohei spin_unlock(&inode->i_lock); 176aa98d7cfSKaiGai Kohei } 177aa98d7cfSKaiGai Kohei 178aa98d7cfSKaiGai Kohei static struct posix_acl *jffs2_get_acl(struct inode *inode, int type) 179aa98d7cfSKaiGai Kohei { 180aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 181aa98d7cfSKaiGai Kohei struct posix_acl *acl; 182aa98d7cfSKaiGai Kohei char *value = NULL; 183aa98d7cfSKaiGai Kohei int rc, xprefix; 184aa98d7cfSKaiGai Kohei 185aa98d7cfSKaiGai Kohei switch (type) { 186aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 187aa98d7cfSKaiGai Kohei acl = jffs2_iget_acl(inode, &f->i_acl_access); 188aa98d7cfSKaiGai Kohei if (acl != JFFS2_ACL_NOT_CACHED) 189aa98d7cfSKaiGai Kohei return acl; 190aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_ACCESS; 191aa98d7cfSKaiGai Kohei break; 192aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 193aa98d7cfSKaiGai Kohei acl = jffs2_iget_acl(inode, &f->i_acl_default); 194aa98d7cfSKaiGai Kohei if (acl != JFFS2_ACL_NOT_CACHED) 195aa98d7cfSKaiGai Kohei return acl; 196aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_DEFAULT; 197aa98d7cfSKaiGai Kohei break; 198aa98d7cfSKaiGai Kohei default: 199aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 200aa98d7cfSKaiGai Kohei } 201aa98d7cfSKaiGai Kohei rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0); 202aa98d7cfSKaiGai Kohei if (rc > 0) { 203aa98d7cfSKaiGai Kohei value = kmalloc(rc, GFP_KERNEL); 204aa98d7cfSKaiGai Kohei if (!value) 205aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 206aa98d7cfSKaiGai Kohei rc = do_jffs2_getxattr(inode, xprefix, "", value, rc); 207aa98d7cfSKaiGai Kohei } 208aa98d7cfSKaiGai Kohei if (rc > 0) { 209aa98d7cfSKaiGai Kohei acl = jffs2_acl_from_medium(value, rc); 210aa98d7cfSKaiGai Kohei } else if (rc == -ENODATA || rc == -ENOSYS) { 211aa98d7cfSKaiGai Kohei acl = NULL; 212aa98d7cfSKaiGai Kohei } else { 213aa98d7cfSKaiGai Kohei acl = ERR_PTR(rc); 214aa98d7cfSKaiGai Kohei } 215aa98d7cfSKaiGai Kohei if (value) 216aa98d7cfSKaiGai Kohei kfree(value); 217aa98d7cfSKaiGai Kohei if (!IS_ERR(acl)) { 218aa98d7cfSKaiGai Kohei switch (type) { 219aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 220aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_access, acl); 221aa98d7cfSKaiGai Kohei break; 222aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 223aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_default, acl); 224aa98d7cfSKaiGai Kohei break; 225aa98d7cfSKaiGai Kohei } 226aa98d7cfSKaiGai Kohei } 227aa98d7cfSKaiGai Kohei return acl; 228aa98d7cfSKaiGai Kohei } 229aa98d7cfSKaiGai Kohei 230aa98d7cfSKaiGai Kohei static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl) 231aa98d7cfSKaiGai Kohei { 232aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 233aa98d7cfSKaiGai Kohei size_t size = 0; 234aa98d7cfSKaiGai Kohei char *value = NULL; 235aa98d7cfSKaiGai Kohei int rc, xprefix; 236aa98d7cfSKaiGai Kohei 237aa98d7cfSKaiGai Kohei if (S_ISLNK(inode->i_mode)) 238aa98d7cfSKaiGai Kohei return -EOPNOTSUPP; 239aa98d7cfSKaiGai Kohei 240aa98d7cfSKaiGai Kohei switch (type) { 241aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 242aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_ACCESS; 243aa98d7cfSKaiGai Kohei if (acl) { 244aa98d7cfSKaiGai Kohei mode_t mode = inode->i_mode; 245aa98d7cfSKaiGai Kohei rc = posix_acl_equiv_mode(acl, &mode); 246aa98d7cfSKaiGai Kohei if (rc < 0) 247aa98d7cfSKaiGai Kohei return rc; 248aa98d7cfSKaiGai Kohei if (inode->i_mode != mode) { 249aa98d7cfSKaiGai Kohei inode->i_mode = mode; 250aa98d7cfSKaiGai Kohei jffs2_dirty_inode(inode); 251aa98d7cfSKaiGai Kohei } 252aa98d7cfSKaiGai Kohei if (rc == 0) 253aa98d7cfSKaiGai Kohei acl = NULL; 254aa98d7cfSKaiGai Kohei } 255aa98d7cfSKaiGai Kohei break; 256aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 257aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_DEFAULT; 258aa98d7cfSKaiGai Kohei if (!S_ISDIR(inode->i_mode)) 259aa98d7cfSKaiGai Kohei return acl ? -EACCES : 0; 260aa98d7cfSKaiGai Kohei break; 261aa98d7cfSKaiGai Kohei default: 262aa98d7cfSKaiGai Kohei return -EINVAL; 263aa98d7cfSKaiGai Kohei } 264aa98d7cfSKaiGai Kohei if (acl) { 265aa98d7cfSKaiGai Kohei value = jffs2_acl_to_medium(acl, &size); 266aa98d7cfSKaiGai Kohei if (IS_ERR(value)) 267aa98d7cfSKaiGai Kohei return PTR_ERR(value); 268aa98d7cfSKaiGai Kohei } 269aa98d7cfSKaiGai Kohei 270aa98d7cfSKaiGai Kohei rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0); 271a1ae76e9SKaiGai Kohei if (!value && rc == -ENODATA) 272a1ae76e9SKaiGai Kohei rc = 0; 273aa98d7cfSKaiGai Kohei if (value) 274aa98d7cfSKaiGai Kohei kfree(value); 275aa98d7cfSKaiGai Kohei if (!rc) { 276aa98d7cfSKaiGai Kohei switch(type) { 277aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 278aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_access, acl); 279aa98d7cfSKaiGai Kohei break; 280aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 281aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_default, acl); 282aa98d7cfSKaiGai Kohei break; 283aa98d7cfSKaiGai Kohei } 284aa98d7cfSKaiGai Kohei } 285aa98d7cfSKaiGai Kohei return rc; 286aa98d7cfSKaiGai Kohei } 287aa98d7cfSKaiGai Kohei 288aa98d7cfSKaiGai Kohei static int jffs2_check_acl(struct inode *inode, int mask) 289aa98d7cfSKaiGai Kohei { 290aa98d7cfSKaiGai Kohei struct posix_acl *acl; 291aa98d7cfSKaiGai Kohei int rc; 292aa98d7cfSKaiGai Kohei 293aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS); 294aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 295aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 296aa98d7cfSKaiGai Kohei if (acl) { 297aa98d7cfSKaiGai Kohei rc = posix_acl_permission(inode, acl, mask); 298aa98d7cfSKaiGai Kohei posix_acl_release(acl); 299aa98d7cfSKaiGai Kohei return rc; 300aa98d7cfSKaiGai Kohei } 301aa98d7cfSKaiGai Kohei return -EAGAIN; 302aa98d7cfSKaiGai Kohei } 303aa98d7cfSKaiGai Kohei 304aa98d7cfSKaiGai Kohei int jffs2_permission(struct inode *inode, int mask, struct nameidata *nd) 305aa98d7cfSKaiGai Kohei { 306aa98d7cfSKaiGai Kohei return generic_permission(inode, mask, jffs2_check_acl); 307aa98d7cfSKaiGai Kohei } 308aa98d7cfSKaiGai Kohei 309aa98d7cfSKaiGai Kohei int jffs2_init_acl(struct inode *inode, struct inode *dir) 310aa98d7cfSKaiGai Kohei { 311aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 312aa98d7cfSKaiGai Kohei struct posix_acl *acl = NULL, *clone; 313aa98d7cfSKaiGai Kohei mode_t mode; 314aa98d7cfSKaiGai Kohei int rc = 0; 315aa98d7cfSKaiGai Kohei 316aa98d7cfSKaiGai Kohei f->i_acl_access = JFFS2_ACL_NOT_CACHED; 317aa98d7cfSKaiGai Kohei f->i_acl_default = JFFS2_ACL_NOT_CACHED; 318aa98d7cfSKaiGai Kohei if (!S_ISLNK(inode->i_mode)) { 319aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(dir, ACL_TYPE_DEFAULT); 320aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 321aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 322aa98d7cfSKaiGai Kohei if (!acl) 323aa98d7cfSKaiGai Kohei inode->i_mode &= ~current->fs->umask; 324aa98d7cfSKaiGai Kohei } 325aa98d7cfSKaiGai Kohei if (acl) { 326aa98d7cfSKaiGai Kohei if (S_ISDIR(inode->i_mode)) { 327aa98d7cfSKaiGai Kohei rc = jffs2_set_acl(inode, ACL_TYPE_DEFAULT, acl); 328aa98d7cfSKaiGai Kohei if (rc) 329aa98d7cfSKaiGai Kohei goto cleanup; 330aa98d7cfSKaiGai Kohei } 331aa98d7cfSKaiGai Kohei clone = posix_acl_clone(acl, GFP_KERNEL); 332aa98d7cfSKaiGai Kohei rc = -ENOMEM; 333aa98d7cfSKaiGai Kohei if (!clone) 334aa98d7cfSKaiGai Kohei goto cleanup; 335aa98d7cfSKaiGai Kohei mode = inode->i_mode; 336aa98d7cfSKaiGai Kohei rc = posix_acl_create_masq(clone, &mode); 337aa98d7cfSKaiGai Kohei if (rc >= 0) { 338aa98d7cfSKaiGai Kohei inode->i_mode = mode; 339aa98d7cfSKaiGai Kohei if (rc > 0) 340aa98d7cfSKaiGai Kohei rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, clone); 341aa98d7cfSKaiGai Kohei } 342aa98d7cfSKaiGai Kohei posix_acl_release(clone); 343aa98d7cfSKaiGai Kohei } 344aa98d7cfSKaiGai Kohei cleanup: 345aa98d7cfSKaiGai Kohei posix_acl_release(acl); 346aa98d7cfSKaiGai Kohei return rc; 347aa98d7cfSKaiGai Kohei } 348aa98d7cfSKaiGai Kohei 349c7afb0f9SKaiGai Kohei void jffs2_clear_acl(struct jffs2_inode_info *f) 350aa98d7cfSKaiGai Kohei { 351aa98d7cfSKaiGai Kohei if (f->i_acl_access && f->i_acl_access != JFFS2_ACL_NOT_CACHED) { 352aa98d7cfSKaiGai Kohei posix_acl_release(f->i_acl_access); 353aa98d7cfSKaiGai Kohei f->i_acl_access = JFFS2_ACL_NOT_CACHED; 354aa98d7cfSKaiGai Kohei } 355aa98d7cfSKaiGai Kohei if (f->i_acl_default && f->i_acl_default != JFFS2_ACL_NOT_CACHED) { 356aa98d7cfSKaiGai Kohei posix_acl_release(f->i_acl_default); 357aa98d7cfSKaiGai Kohei f->i_acl_default = JFFS2_ACL_NOT_CACHED; 358aa98d7cfSKaiGai Kohei } 359aa98d7cfSKaiGai Kohei } 360aa98d7cfSKaiGai Kohei 361aa98d7cfSKaiGai Kohei int jffs2_acl_chmod(struct inode *inode) 362aa98d7cfSKaiGai Kohei { 363aa98d7cfSKaiGai Kohei struct posix_acl *acl, *clone; 364aa98d7cfSKaiGai Kohei int rc; 365aa98d7cfSKaiGai Kohei 366aa98d7cfSKaiGai Kohei if (S_ISLNK(inode->i_mode)) 367aa98d7cfSKaiGai Kohei return -EOPNOTSUPP; 368aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS); 369aa98d7cfSKaiGai Kohei if (IS_ERR(acl) || !acl) 370aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 371aa98d7cfSKaiGai Kohei clone = posix_acl_clone(acl, GFP_KERNEL); 372aa98d7cfSKaiGai Kohei posix_acl_release(acl); 373aa98d7cfSKaiGai Kohei if (!clone) 374aa98d7cfSKaiGai Kohei return -ENOMEM; 375aa98d7cfSKaiGai Kohei rc = posix_acl_chmod_masq(clone, inode->i_mode); 376aa98d7cfSKaiGai Kohei if (!rc) 377aa98d7cfSKaiGai Kohei rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, clone); 378aa98d7cfSKaiGai Kohei posix_acl_release(clone); 379aa98d7cfSKaiGai Kohei return rc; 380aa98d7cfSKaiGai Kohei } 381aa98d7cfSKaiGai Kohei 382aa98d7cfSKaiGai Kohei static size_t jffs2_acl_access_listxattr(struct inode *inode, char *list, size_t list_size, 383aa98d7cfSKaiGai Kohei const char *name, size_t name_len) 384aa98d7cfSKaiGai Kohei { 385aa98d7cfSKaiGai Kohei const int retlen = sizeof(POSIX_ACL_XATTR_ACCESS); 386aa98d7cfSKaiGai Kohei 387aa98d7cfSKaiGai Kohei if (list && retlen <= list_size) 388aa98d7cfSKaiGai Kohei strcpy(list, POSIX_ACL_XATTR_ACCESS); 389aa98d7cfSKaiGai Kohei return retlen; 390aa98d7cfSKaiGai Kohei } 391aa98d7cfSKaiGai Kohei 392aa98d7cfSKaiGai Kohei static size_t jffs2_acl_default_listxattr(struct inode *inode, char *list, size_t list_size, 393aa98d7cfSKaiGai Kohei const char *name, size_t name_len) 394aa98d7cfSKaiGai Kohei { 395aa98d7cfSKaiGai Kohei const int retlen = sizeof(POSIX_ACL_XATTR_DEFAULT); 396aa98d7cfSKaiGai Kohei 397aa98d7cfSKaiGai Kohei if (list && retlen <= list_size) 398aa98d7cfSKaiGai Kohei strcpy(list, POSIX_ACL_XATTR_DEFAULT); 399aa98d7cfSKaiGai Kohei return retlen; 400aa98d7cfSKaiGai Kohei } 401aa98d7cfSKaiGai Kohei 402aa98d7cfSKaiGai Kohei static int jffs2_acl_getxattr(struct inode *inode, int type, void *buffer, size_t size) 403aa98d7cfSKaiGai Kohei { 404aa98d7cfSKaiGai Kohei struct posix_acl *acl; 405aa98d7cfSKaiGai Kohei int rc; 406aa98d7cfSKaiGai Kohei 407aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(inode, type); 408aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 409aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 410aa98d7cfSKaiGai Kohei if (!acl) 411aa98d7cfSKaiGai Kohei return -ENODATA; 412aa98d7cfSKaiGai Kohei rc = posix_acl_to_xattr(acl, buffer, size); 413aa98d7cfSKaiGai Kohei posix_acl_release(acl); 414aa98d7cfSKaiGai Kohei 415aa98d7cfSKaiGai Kohei return rc; 416aa98d7cfSKaiGai Kohei } 417aa98d7cfSKaiGai Kohei 418aa98d7cfSKaiGai Kohei static int jffs2_acl_access_getxattr(struct inode *inode, const char *name, void *buffer, size_t size) 419aa98d7cfSKaiGai Kohei { 420aa98d7cfSKaiGai Kohei if (name[0] != '\0') 421aa98d7cfSKaiGai Kohei return -EINVAL; 422aa98d7cfSKaiGai Kohei return jffs2_acl_getxattr(inode, ACL_TYPE_ACCESS, buffer, size); 423aa98d7cfSKaiGai Kohei } 424aa98d7cfSKaiGai Kohei 425aa98d7cfSKaiGai Kohei static int jffs2_acl_default_getxattr(struct inode *inode, const char *name, void *buffer, size_t size) 426aa98d7cfSKaiGai Kohei { 427aa98d7cfSKaiGai Kohei if (name[0] != '\0') 428aa98d7cfSKaiGai Kohei return -EINVAL; 429aa98d7cfSKaiGai Kohei return jffs2_acl_getxattr(inode, ACL_TYPE_DEFAULT, buffer, size); 430aa98d7cfSKaiGai Kohei } 431aa98d7cfSKaiGai Kohei 432aa98d7cfSKaiGai Kohei static int jffs2_acl_setxattr(struct inode *inode, int type, const void *value, size_t size) 433aa98d7cfSKaiGai Kohei { 434aa98d7cfSKaiGai Kohei struct posix_acl *acl; 435aa98d7cfSKaiGai Kohei int rc; 436aa98d7cfSKaiGai Kohei 437aa98d7cfSKaiGai Kohei if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) 438aa98d7cfSKaiGai Kohei return -EPERM; 439aa98d7cfSKaiGai Kohei 440aa98d7cfSKaiGai Kohei if (value) { 441aa98d7cfSKaiGai Kohei acl = posix_acl_from_xattr(value, size); 442aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 443aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 444aa98d7cfSKaiGai Kohei if (acl) { 445aa98d7cfSKaiGai Kohei rc = posix_acl_valid(acl); 446aa98d7cfSKaiGai Kohei if (rc) 447aa98d7cfSKaiGai Kohei goto out; 448aa98d7cfSKaiGai Kohei } 449aa98d7cfSKaiGai Kohei } else { 450aa98d7cfSKaiGai Kohei acl = NULL; 451aa98d7cfSKaiGai Kohei } 452aa98d7cfSKaiGai Kohei rc = jffs2_set_acl(inode, type, acl); 453aa98d7cfSKaiGai Kohei out: 454aa98d7cfSKaiGai Kohei posix_acl_release(acl); 455aa98d7cfSKaiGai Kohei return rc; 456aa98d7cfSKaiGai Kohei } 457aa98d7cfSKaiGai Kohei 458aa98d7cfSKaiGai Kohei static int jffs2_acl_access_setxattr(struct inode *inode, const char *name, 459aa98d7cfSKaiGai Kohei const void *buffer, size_t size, int flags) 460aa98d7cfSKaiGai Kohei { 461aa98d7cfSKaiGai Kohei if (name[0] != '\0') 462aa98d7cfSKaiGai Kohei return -EINVAL; 463aa98d7cfSKaiGai Kohei return jffs2_acl_setxattr(inode, ACL_TYPE_ACCESS, buffer, size); 464aa98d7cfSKaiGai Kohei } 465aa98d7cfSKaiGai Kohei 466aa98d7cfSKaiGai Kohei static int jffs2_acl_default_setxattr(struct inode *inode, const char *name, 467aa98d7cfSKaiGai Kohei const void *buffer, size_t size, int flags) 468aa98d7cfSKaiGai Kohei { 469aa98d7cfSKaiGai Kohei if (name[0] != '\0') 470aa98d7cfSKaiGai Kohei return -EINVAL; 471aa98d7cfSKaiGai Kohei return jffs2_acl_setxattr(inode, ACL_TYPE_DEFAULT, buffer, size); 472aa98d7cfSKaiGai Kohei } 473aa98d7cfSKaiGai Kohei 474aa98d7cfSKaiGai Kohei struct xattr_handler jffs2_acl_access_xattr_handler = { 475aa98d7cfSKaiGai Kohei .prefix = POSIX_ACL_XATTR_ACCESS, 476aa98d7cfSKaiGai Kohei .list = jffs2_acl_access_listxattr, 477aa98d7cfSKaiGai Kohei .get = jffs2_acl_access_getxattr, 478aa98d7cfSKaiGai Kohei .set = jffs2_acl_access_setxattr, 479aa98d7cfSKaiGai Kohei }; 480aa98d7cfSKaiGai Kohei 481aa98d7cfSKaiGai Kohei struct xattr_handler jffs2_acl_default_xattr_handler = { 482aa98d7cfSKaiGai Kohei .prefix = POSIX_ACL_XATTR_DEFAULT, 483aa98d7cfSKaiGai Kohei .list = jffs2_acl_default_listxattr, 484aa98d7cfSKaiGai Kohei .get = jffs2_acl_default_getxattr, 485aa98d7cfSKaiGai Kohei .set = jffs2_acl_default_setxattr, 486aa98d7cfSKaiGai Kohei }; 487